Optical method and apparatus for determining three-dimensional changes in facial contours
US4825263A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 2, 1987 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | Jun 2, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T7/521
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of optically mapping a person's face includes the steps of illuminating the face through a grid structure to produce a grid representation on the face; viewing the illuminated face with a video camera; producing a video signal in response to the step of viewing; converting the video signal to digital form; storing a frame of the digitized video signal in a frame memory; defining the grid representation on the face, from the stored video signal; locating coordinates of the intersection points of the grid representation; determining curvatures of the grid representation at the located intersection points; and three-dimensionally reconstructing the surface of the face from the coordinates and curvatures of the intersection points.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.